That clamp looks to be part of the display only. It looks to me like it is holding the foe steerer tube. The Colnago headset that is supplied with the C 59 has two top caps, one that is flat and a second one that stacks on top of it that has the cone shape. You can choose to not use the tapered cone for a really slammed set up.

"1 Calculate the proper height for the positioning of the stem on the fork steerer tube, pushing the stem shaft against the compression ring of the headset."-from the instructions.So you leave the top cover off, the clamp replaces it.The top cover does not have to match the outer diameter of the head tube to look good. It just shouldn't overhang it. As far as sealing, most do not employ a rubber seal, some do, but it is generally a non-issue.

With those last two responses, I can only utter one of two things:Deda Zero One; or Deda Superleggera. I'm not sure which. Marginal weight saving with the Superleggera but it is twice the price of the Zero 100. Thoughts?

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